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      1 /*
      2  * Copyright 2015 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "SkCanvas.h"
     10 #include "SkData.h"
     11 #include "SkImage.h"
     12 #include "SkPictureRecorder.h"
     13 #include "SkSurface.h"
     14 
     15 static void draw_something(SkCanvas* canvas, const SkRect& bounds) {
     16     SkPaint paint;
     17     paint.setAntiAlias(true);
     18     paint.setColor(SK_ColorRED);
     19     paint.setStyle(SkPaint::kStroke_Style);
     20     paint.setStrokeWidth(10);
     21     canvas->drawRect(bounds, paint);
     22     paint.setStyle(SkPaint::kFill_Style);
     23     paint.setColor(SK_ColorBLUE);
     24     canvas->drawOval(bounds, paint);
     25 }
     26 
     27 typedef sk_sp<SkImage> (*ImageMakerProc)(GrContext*, SkPicture*, const SkImageInfo&);
     28 
     29 static sk_sp<SkImage> make_raster(GrContext*, SkPicture* pic, const SkImageInfo& info) {
     30     auto surface(SkSurface::MakeRaster(info));
     31     surface->getCanvas()->clear(0);
     32     surface->getCanvas()->drawPicture(pic);
     33     return surface->makeImageSnapshot();
     34 }
     35 
     36 static sk_sp<SkImage> make_texture(GrContext* ctx, SkPicture* pic, const SkImageInfo& info) {
     37     if (!ctx) {
     38         return nullptr;
     39     }
     40     auto surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info));
     41     if (!surface) {
     42         return nullptr;
     43     }
     44     surface->getCanvas()->clear(0);
     45     surface->getCanvas()->drawPicture(pic);
     46     return surface->makeImageSnapshot();
     47 }
     48 
     49 static sk_sp<SkImage> make_pict_gen(GrContext*, SkPicture* pic, const SkImageInfo& info) {
     50     return SkImage::MakeFromPicture(sk_ref_sp(pic), info.dimensions(), nullptr, nullptr,
     51                                     SkImage::BitDepth::kU8,
     52                                     SkColorSpace::MakeSRGB());
     53 }
     54 
     55 static sk_sp<SkImage> make_encode_gen(GrContext* ctx, SkPicture* pic, const SkImageInfo& info) {
     56     sk_sp<SkImage> src(make_raster(ctx, pic, info));
     57     if (!src) {
     58         return nullptr;
     59     }
     60     sk_sp<SkData> encoded = src->encodeToData(SkEncodedImageFormat::kPNG, 100);
     61     if (!encoded) {
     62         return nullptr;
     63     }
     64     return SkImage::MakeFromEncoded(std::move(encoded));
     65 }
     66 
     67 const ImageMakerProc gProcs[] = {
     68     make_raster,
     69     make_texture,
     70     make_pict_gen,
     71     make_encode_gen,
     72 };
     73 
     74 /*
     75  *  Exercise drawing pictures inside an image, showing that the image version is pixelated
     76  *  (correctly) when it is inside an image.
     77  */
     78 class ImageShaderGM : public skiagm::GM {
     79     sk_sp<SkPicture> fPicture;
     80 
     81 public:
     82     ImageShaderGM() {}
     83 
     84 protected:
     85     SkString onShortName() override {
     86         return SkString("image-shader");
     87     }
     88 
     89     SkISize onISize() override {
     90         return SkISize::Make(850, 450);
     91     }
     92 
     93     void onOnceBeforeDraw() override {
     94         const SkRect bounds = SkRect::MakeWH(100, 100);
     95         SkPictureRecorder recorder;
     96         draw_something(recorder.beginRecording(bounds), bounds);
     97         fPicture = recorder.finishRecordingAsPicture();
     98     }
     99 
    100     void testImage(SkCanvas* canvas, SkImage* image) {
    101         SkAutoCanvasRestore acr(canvas, true);
    102 
    103         canvas->drawImage(image, 0, 0);
    104         canvas->translate(0, 120);
    105 
    106         const SkShader::TileMode tile = SkShader::kRepeat_TileMode;
    107         const SkMatrix localM = SkMatrix::MakeTrans(-50, -50);
    108         SkPaint paint;
    109         paint.setShader(image->makeShader(tile, tile, &localM));
    110         paint.setAntiAlias(true);
    111         canvas->drawCircle(50, 50, 50, paint);
    112     }
    113 
    114     void onDraw(SkCanvas* canvas) override {
    115         canvas->translate(20, 20);
    116 
    117         const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
    118 
    119         for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
    120             sk_sp<SkImage> image(gProcs[i](canvas->getGrContext(), fPicture.get(), info));
    121             if (image) {
    122                 this->testImage(canvas, image.get());
    123             }
    124             canvas->translate(120, 0);
    125         }
    126     }
    127 
    128 private:
    129     typedef skiagm::GM INHERITED;
    130 };
    131 DEF_GM( return new ImageShaderGM; )
    132